D6N Track-Type Tractor Caterpillar

Illustration 1	g03600556
Circuit for the CAN data link

Illustration 2	g02722153
Location of the machine ECM

Illustration 3	g01898493
Location of the implement ECM

The CID 1558 FMI 09 code is associated with communication between the Machine Electronic Control Module (ECM) and the Implement ECM.

The FMI 09 means that the Machine ECM is not receiving any communication from the Implement ECM on the involved CAN data link circuit.

An additional diagnostic code may be activated in order to indicate the data link that is involved with this diagnostic code. The additional diagnostic code that may be activated could be the following:

CID 0247 - FMI 09 - SAE J1939 Data Link - Abnormal Update Rate

Determine the additional diagnostic code that has been activated with the CID 1558 FMI 09 diagnostic code.

When the CID 1558 FMI 09 diagnostic code is cleared, the additional diagnostic code for the data link will also be cleared.

The possible causes of the CID 1558 FMI 09 diagnostic code are listed below:

• An open or a poor connection exists in the data link circuit.

• The Electronic Implement Control has failed. An ECM failure is unlikely.

• The Machine ECM has failed. An ECM failure is unlikely.

Note: A loss of electrical power to the Electronic Implement Control can cause the Machine ECM to activate this diagnostic code. Ensure that the Electronic Implement Control is powered up before proceeding with this procedure. Clear all diagnostic codes that are associated with the Electronic Implement Control before proceeding with this procedure.

Note: Ensure that the CID 1558 FMI 09 diagnostic code is active before performing this procedure.

Test Step 1. CHECK THE DATA LINK CIRCUIT FOR AN OPEN

1. Turn the key switch and the disconnect switch to the OFF position.

2. Refer to the illustration for the CAN network at the beginning of this procedure. Disconnect all components that are on the CAN network from the machine harness including the CAN resistors.

3. Inspect the harness connectors and clean all of the contacts of all of the harness connectors. Ensure that the wires are secured in the connector, the contacts are clean, and the contacts are in good condition.

   Refer to the Troubleshooting, "Electrical Connector - Inspect" in this manual.

4. At the disconnected harness connector for the Implement ECM, connect a jumper wire between contact J2-64 (wire F711-YL) and contact J2-65 (wire F712-GN).

5. At the disconnected harness connector J2 for the Machine Control ECM, measure the resistance between contact J2-67 (wire F711-YL) and contact J2-68 (wire F712-GN).

Expected Result:

The resistance measurement is 5 ohms or less.

Results:

• OK - The resistance measurement is 5 ohms or less than 5 ohms. The CAN data Link circuit between the Implement ECM and the Machine Control ECM is not open. Proceed to Test Step 2.

• NOT OK - The resistance measurement is greater than 5 ohms.

  Repair: There is an open or a bad connection in the CAN data link circuit in the machine harness.
  Refer to the complete machine Electrical System Schematic. Locate and examine all of the machine harness connections that are involved in the data link circuit. Check each wire section from connector to connector for an open or a bad connection.
  Ensure that all connections are clean, secure and in good condition. Repair or replace the machine harness.

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Test Step 2. CHECK THE STATUS OF THE DIAGNOSTIC CODE

1. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the data link circuit.

2. Reconnect all harness connectors. Make sure that the connectors are fully seated and the clips for each connector are fastened.

   Refer to the Troubleshooting, "Electrical Connector - Inspect" in this manual.

3. Turn the disconnect switch and the key start switch to the ON position.

4. Operate the machine.

5. Check the status of the CID 1558 FMI 09 diagnostic code.

Expected Result:

The CID 1558 FMI 09 diagnostic code is not active.

Results:

• OK - The CID 1558 FMI 09 diagnostic code is not active. The diagnostic code does not exist at this time. The initial diagnostic code was probably caused by a poor connection or a short at one of the connectors that was disconnected and reconnected. Resume normal operationSTOP

• NOT OK - The CID 1558 FMI 09 diagnostic code is active. The diagnostic code has not been corrected.

  Repair: Check the circuit again. Use Caterpillar Electronic Technician (Cat^® ET), if available, to perform a "Wiggle Test" on the machine wiring harness. The wiggle test can detect momentary or intermittent shorts or opens in the machine wiring harness.
  ECM failure is unlikely. Verify that all possible causes of the diagnostic code have been investigated. Repeat this procedure again.
  If the diagnostic code remains active or is repeatedly activated and no cause is found, flash the ECM with the latest version of software. Ensure that you have the latest version of software for your specific machine and ECM. Refer to the Troubleshooting, "Electronic Control Module (ECM) - Flash Program" in this manual for the correct procedure.
  If still present after flashing the latest software, contact your dealer Technical Communicator for possible consultation with Caterpillar. This consultation may greatly reduce repair time.

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